Raunchy, funny 'Deadpool 2' proves that good sequels do exist

What to say about "Deadpool 2" that won't step on the self-referential jokes that make up most of its running time? Very little, and I would never do that, even if I hadn't been expressly warned not to in a jokey pre-screening PSA from star Ryan Reynolds. In the most carefully vague of terms, I...